puruitong-demo/DialogLibrary/src/main/res/drawable/drawable_round_green_dark.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <!--圆角的半径,设置圆角半径-->
    <corners android:radius="2dp" />

    <!-- 渐变 -->
    <gradient
        android:angle="270"
        android:endColor="#3C7E18"
        android:startColor="#3C7E18" />


    <!-- 填充，填充的颜色 -->
    <solid android:color="#3C7E18" />

    <!-- 描边 -->
    <stroke
        android:width="0.5dp"
        android:color="#3C7E18" />

</shape>